Arm sling



FIG. 1 is a front, top, and left side perspective view showing the design;

FIG. 2 is a top plan view the design;

FIG. 3 is a left side elevational view of design;

FIG. 4 is a rear elevational view of the design;

FIG. 5 is a front elevational view of the design;

FIG. 6 is a right side elevational view of the design;

FIG. 7 is a bottom plan view of the design; and,

FIG. 8 is a front, top and left side perspective view of the design.

The broken lines illustrate environmental structure which forms no part of the claimed design. 

The ornamental design for an arm sling, as shown and described. 